While I was playing tonight I thought of an Idea that would probably be simple to incorporate.
As well as (or instead of) the star system to tag wich emu runs the rom the best, I thought it might be cool if you had an orb or circle there that you could change the color of, and have one over each emu.
So... Say the game is Goldeneye, you would see the list of the 3 emulators and above each would be a circle that you could change the color of (blue, orange, red) so that you can tell which emus work and which don't. As well you could have the star so you would know which is the prefered.
In the above example you would have a red circle above 1964, a blue circle over pj64, and a blue circle with a star in it (beside it, above it...whatever) over ultrahle.
You could cycle through the colors by pressing one button (say X)and add a star using another (say Y, as is the current), or you could assign a color to x, y and b and add a star using one of the black and white buttons (I personally think the first option would be the simplest and best).
For the Orbs you could photoshop up 3 different colors of the xbox jelwel (or something else that would look equally as impressive) and in the emu you could just overlay the current star over top.
Just thought this would be cool as the colors go along the same lines as most compatibility lists you see out there.